Gate-valve.



Patented Aug. 3, 1915.

2 SHEETS-SHEET l.

W INVENTOR. SXMCQ. W Mm.

ATTORNEY.

F. W. HUDSON.

GATE VALVE.

APPLICATION FILED APR. I, 1912.

WITNESSES zizr F. W. HUDSON.

GATE VALVE.

APPLICATION FILED APR-1. 1912.

1,149,057. Patented Aug. 3, 1915.

WITNESSES IN VEN TOR.

ATTORNEY.

COLUMBIA PLANOORAPM $0.. WASHINGTON. D. c.

FRANK W. HUDSON, OF SHARON, PENNSYLVANIA,ASSIGNOB, BY DIRECT AND MESNE ASSIGNMENTS, TO HORACE DAVIS, 0F SHARON, PENNSYLVANIA.

GATE VALVE.

fipplicaticnfiled April 1, 1912.

To all whom itmay concern Be itknown that I, FRANK W. HUnsoN, citizen of the United States, residing at Sharon, in the county of Mercer and State of Pennsylvania, have invented certain new and useful Improvements in Gate-Valves, of which the following is a specification.

This invention relates to valves of the type known as gate valves;

One of the objects of' this invention is the provision of such a valve with means for protectingthe valve gate proper from the action" of the fluid controlled by the valve. A further object isthe provision of such a valve with seats which, While the valve is opened, areprotectedfrom the action of the fluid" passing through the valve.

A stillfurtherobject is to obtain a valve of this type which, when opened, affords tion, Figure 1 is a side cross sectional elevation of my gate valve, when closed, showing the gate members pressing the protector belowthe valve seat and the protector shields abutting against the valve seat, the gate members being pressed against the seats by the action of the tapered valve stem. Fig. 2is ahorizontal'cross section taken on the line XX of Fig. 1 and showingthe relative arrangement of the gate members, shield springs and shields. Fig. 3 is a planview of one of the shields. Fig. 4: is a rear elevation of one ofthe shields showing lug thereon. one of' the gate members, showing the tapered cavity for the stem and collar. Fig.

6 is anelevation' of the curvedside of the gate member showing the slot for the reception of the shieldlug with the spring thereon. Fig; 7 isthe'same view as Fig. 6 showing the position-0f the shield relative to the Specification of Letters Patent.

Fig. 5 represents the flat side of Patented Aug. 5?, 1915.

Serial no. 687,800.

gate memberwhen the lug is at the bottom of the slot.

Referring now to the several figures in which like reference characters designate likeparts, (1) is the valve body proper, provided with threads (2) for pipe connection thereto.

(3) isthe plugseat in which the bottom plug (5) is screwed.

l) is a cavity within the lower portion of thevalvewhich will be referred to as'a protector cavity. 1

The seatprotector' (6)is provided witha stem (7) which, as shown, is hollow and contains within: it the spring: (9) which isseated on the spring seat (8) and extending up from which into'the spring is the boss: (10). Theupper part of the valve comprises the bonnet seat (11) having its upper inner portion threaded at" (12) for the reception of the bonnet (13); At the upper'portion of this bonnet is the stufiing bOX*(1f) provided with packing (15). At thet'opofthis is the gland (18) held in place by the gland nut orcap (17). The present valve'which' is of the rising stem variety is provided with the stem (20) having at its upper endthe handwheel (19). llhe bonnet'is provided with female threads (21) in which the mal'e threads (22) of the stem engage. The rear portionof this stem'is tapere'd in' shape as at (23) and between the tapered and threaded portions is provided with theicollar (24:)

We come now to the peculiar construction of the valve gate proper.

(25) designates a two membered valve gate, each member being provided withlateral' eXtensions (25). The inner and upper portion of these valve gates is provided with a'recess adapted to fit'loosely about the collar (24) of thestem. As will be noted from the detailed views of these gate members, each in cross section represents a semi-circle,

andas shown in'the side elevation, the com bined gates have a circular flange extending outwardly around'the upper portion, as at (255). Each gate'member is'at its outer central portion provided with a spring cavity (27) closed at the top by a plug (26) and having thereina spring (28). Cutting into this cavity from the lower portion of" thegate is a slot (29). As better illustrated in Figs; 3'and a, a shield (31) ofthe same" ing upwardly, the protector (6) impelled by Y curvature as the gate and of equal thickness with the gate flange covers the outer portion of each gate. The shield is provided with a lug (30) extending into a slot (29) and on which the shield spring (28) rests. valve seat (32), which is of a diameter equal to that of the protector (6) is flush with the inner side of the shield member.

In operation, my valve works as follows Beginning with the position of the members as shown in Fig. 1, upon turning the hand wheel to the left,-the stem (20) rises and the top of the collar (24) engages the top of the gate cavity drawing the valve gate members upwardly. During the initial movement of the valve gate, the shield spring, presslng upon the shield lug, maintains the bottom of the shields against the valve seat and the shields do not rise untilthe bottom of the gate slot comes in contact with the shield lug, preventing further relatlve movement between the shield and the gate and drawing the shield upwardly with the gate; the

bottomof the shield now being flush with the lower side of the gate members. At the same time as the gate memberhas been movthe spring (9) moves up until it is flush with the valve seat (32), thus presenting a fiat continuous bottom surface through the valve. The lateral extensions (25) which,

. where they have a bearing on the side ofthe I valve seat.

protector, are fiat, continue on upwardly with the valve gate and when the gate has reached its maximum height still engage the sides of the protector. Reversing the operation, when the hand wheel is turned to the right, the stem moves downwardly carrying with it the valve gate. The lateral extensions on the gate members move down relative to the protector. The protector remains flush with the bottom of the valve passage until the bottom surface of the gate comes in contact with it. Simultaneously, the bottom of each shield contacts with'and covers the valve seat. The valve gate now continuing downward, the shields remain stationary, the shield spring (28) becoming tensioned, whilethe protector (6), in opposition to its spring, moves downward allowingthe gate members to pass down into the When the protector extension contacts with the bottom gate all further downward movement of the protector and valve gate is stopped, but by reason of the tapered valve stem fitting into a corresponding recess in the two membered gate, the two members 'are forced apart and against the valve seat, thus'tightening the connection.

It will thus be seen that when the valve is closed all surfaces which while the valve is open are exposed to the fluids are doubly shielded and protected from such fluid. Moreover, byreason of the movable protecting. member (6) coming flush with thebot- The tom of the valve passage while the valve is opened, no dirt or foreign substances can accumulate thus eliminating frequent cleaning of the valve.

When the valve is opened, thevalve seat as to its side is protected by the downward extensions (25) on the gate members. As

to the remainder, as before explained, the protector (6) is effective. The cross section of the opening of the valve at right angles to the fluid flow is therefore rectangular, the

flat bottom of the gate members supplying the top and the flat top of the protector (6) being the bottom, while the sides are formed by the, straight downward extensions (25) of the gate members.

I claim 1. A gate valve having a seat therein,

means operative to protect the whole of said seat while the valve is open, and other means operative to protect the whole of said seat when the valve is closed.

2. In a gate. valve, having a seat therein, the combination with the seat of two alternatively operative means protecting the whole of the seat.

3. In a gate valve, the combination of a seat and a plurality of means for protecting 6. In a gate valve having a seat and a gate cooperative therewith to close the valve, the combination of means for protecting said seat and other means for protecting said gate, both of said means being operative While the valve is beingopened.

7. In a gate valve having a seat and a gate cooperative therewith to close the valve, the combination of means for protecting said seat and other means forprotect ingsaid gate, both of said means being operative while the valve is open, said lattermeans being operative when the valve is closed.

8. In a gate valve having a seat and gate cooperative therewith, the combination of a seat protector and gate protectors, said protectors having vertical movement during the closing of the valve.

9. In a gate valve having a seat and gate cooperative therewith, the combination of members on said gate operative to protect a portion of the seat when the gate is opened or closed, and other members cooperative with the gate to protect the other portions of the seat only when the valve is closed.

10. In a gate valve having a seat and gate cooperative therewith, the combination of gate members, protectors therefor, lateral extensions on said gates, and a movable member cooperative with said gate members and extensions to afford a straightaway rectangular fluid passage when the valve is in any open position.

11. In a gate valve having a seat and gat cooperative therewith, the combination of members positioned on the gate and adapted to move relatively thereto, a member within the seat and adapted to move relatively thereto, and springs operative to move all of said members when the valve is opened.

12. In a gate valve, the combination of a gate comprising a plurality of members, protectors on said gate, a valve stem having loose motion within and between said members, a valve seat, a movable protector within the valve seat, said valve stem resting in a tapered cavity in the gate members whereby the gate members are moved relative to the valve seat and to the protector during the rotation of the valve stem.

13. In a gate valve having a straightaway fiuid passage, a gate, a seat comprising bottom and side portions and members adapted to move to a flush position with all of the said portions when the valve is open, whereby the whole of said seat and members cooperate to protect each other from the action of the fluid passing through the valve.

In testimony whereof I affix my signature in presence of two witnesses.

FRANK W. HUDSON.

Witnesses:

C. H. Hoxn, EUGENE E. ANDERSON.

Copies of this patent may he obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

